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Summary of Significant Accounting Policies - Statement of Cash Flows and Supplemental Disclosure of Non-Cash Investing and Financing Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract]      
Mortgages assumed from acquisitions $ 969,700,000 $ 271,600,000 $ 173,000,000
Elimination of the previously held equity interest in unconsolidated joint ventures acquired 186,500,000 36,800,000 200,000
Accounts payable related to construction in progress 21,500,000 18,200,000 3,400,000
Write-off of preferred share original issuance costs 5,246,000 5,804,000 6,402,000
Dividends declared 55,107,000 44,210,000 29,100,000
Equity derivative liability - affiliate 0 0 74,300,000
Deconsolidation of net assets $ 0 $ 0 $ 5,000,000